Power circuit breaker



FIG. 1 is a view of the front of an power circuit breaker showing my new design;

FIG. 2 is a view of the right side of my design;

The FIG. 3 is a view of the top of my design;

FIG. 4 is a view of the back of my design;

FIG. 5 is a view of the left side of my design;

FIG. 6 is a view of the bottom of my design; and,

FIG. 7 is a perspective view of my design. 

The ornamental design for a power circuit breaker, as shown and described. 